JPH056581A - Production of optical information recording carrier - Google Patents

Abstract

PURPOSE:To improve durability and reliability by forming an org. dye recording layer of the same area as the area of a reflection layer or slightly wider, forming the reflection layer apart margins provided on the inner and outer peripheries of a substrate and dissolving and splashing the recording layer wider than the reflection layer by a solvent incorporated in a protective layer enclosing the entire surface. CONSTITUTION:The org. dye recording layer 2 is applied over the entire surface and the position where the film formation is started is made the same as the layer 3 or wider than this layer in the film forming stage of the next reflection layer 3. A holder (blind) is mounted on the innermost and outermost peripheries of the substrate 1 and the film of the layer 3 is formed by providing the margins on the innermost and outermost peripheries of the substrate 1; thereafter, the holder is removed and a UV resin is applied by spin coating while the substrate 1 is kept rotated. The solvent incorporated in the UV resin dissolves and splashes the margin parts of the layer 2 which are not coated with the layer 3. The org. dyes do not remain any more and the protective layer 4 consisting of the UV resin is tightly adhered to the substrate 1. The peeling of the layer 4 and the deteriorating of the layer 2 by temp., humidity, mechanical damage, etc., are prevented in this way and the exact recording and reproducing of information over a long period of time are possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an optical information record carrier in which information is recorded and reproduced by using a light beam.

[0002]

2. Description of the Related Art An optical information recording carrier is sometimes used for the purpose of long-term storage of data, and it is necessary to be able to read and write recorded data accurately even if it is left in an environment of high temperature and high humidity. In a single-disc structure such as a compact disc, a structure in which an ultraviolet curable resin layer (hereinafter referred to as a UV resin layer), which is a protective layer located at the uppermost layer, covers a lower recording layer and a reflective layer, that is, UV on the innermost and outermost part of the substrate
It is known that direct contact between the resin layer and the substrate is necessary for long-term storage of data.

For example, when a film is formed by vapor deposition, sputtering, etc., a disk structure as described above can be easily manufactured by providing a holder (blind) on the inner and outer peripheral portions.

[0004]

However, in an optical information recording carrier having an organic dye layer, the dye layer is formed by a spin coating method unlike vapor deposition, sputtering, etc. It is almost impossible to control the area due to uneven film thickness. The present invention provides a method for producing an optical information record carrier having a structure in which a UV resin layer easily covers a recording layer and a reflective layer and is in contact with a substrate without causing such a problem as film thickness unevenness. Has an aim.

[0005]

Therefore, the present invention is an optical information recording carrier in which at least a substrate, an organic dye-based recording layer, a reflective layer and a protective layer are laminated, and the innermost and outermost layers of the substrate are provided. A reflective layer formed by providing a margin on the outer periphery, the organic dye-based recording layer formed substantially from the inner diameter of the reflective layer or from the outer periphery thereof, a protective layer encapsulating the entire surface by spin coating, Characterized in that the organic dye recording layer on the outer periphery of the reflective layer is dissolved and scattered by a solvent contained in the resin of the protective layer, and the innermost periphery and outermost periphery of the substrate are closely adhered by the protective layer. Is.

[0006]

Therefore, in the disk manufacturing method as described above, the exposed dye layer on the outermost peripheral portion of the substrate is easily dissolved in the solvent, and thus is scattered from the plate surface by spin coating. In addition, since the starting position of the film of the dye layer is the same as the innermost periphery or on the outer periphery side, the innermost periphery of the substrate can be in close contact with the protective layer.

[0007]

EXAMPLE FIG. 1 was produced by the manufacturing method of the present invention.
It is sectional drawing which shows one Example of an optical information record carrier. That is,
An organic dye recording layer 2, a gold reflecting layer 3, and a UV resin layer 4 as a protective layer were laminated on a polycarbonate substrate 1. Here, the substrate 1 is not limited to polycarbonate, and as conventionally known, a plastic material such as PMMA, polyolefin, or epoxy, a glass plate, a metal plate such as Al, or the like can be used.

The organic dye recording layer 2 is made of cyanine dye, phthalocyanine dye, naphthoquinone dye, or the like.
The reflective layer 3 is also made of gold, silver, copper, nickel, chromium, aluminum, nickel-chromium, or the like.

Next, the manufacturing process is shown by the process diagram of FIG. First, the organic dye recording layer 2 is applied to the entire surface of the substrate 1 by spin coating. Here, the film formation start position of the innermost circumference is set to the same start position as the reflection layer 3 in the next film formation process of the reflection layer 3, or to the outer peripheral side of the substrate 1 with respect to that of the reflection layer 3. Next, a holder (blind) on the innermost periphery of the substrate 1.
And the reflective layer 2 is formed by vapor deposition or sputtering.

Then, the holder is removed, the substrate 1 is attached to the spinner device again, and a solvent such as methanol or ethanol is atomized and ejected while rotating to dissolve and scatter the organic dye recording layer on the outer peripheral portion. As for the solvent, one that does not adversely affect each substrate 1 is used. Alternatively, spin coat a UV resin. Since the solvent contained in the UV resin dissolves the above-mentioned organic dye recording layer, it is dissolved in the same manner as the solvent, and the solvent is scattered from the surface of the substrate to eliminate the residual organic dye. In this way, since the organic dye recording layer does not exist in the blank portion not covered with the reflective layer, the protective layer made of UV resin or the like can be brought into close contact with the substrate 1.

The optical information recording carrier according to this embodiment was irradiated with a laser beam to record an EFM signal at a linear velocity of 1.4 m / s, and then a block error occurred when a temperature / humidity cycle test of JIS C5024M-1 was performed. The changes are shown in FIG. It should be noted that one cycle in this test corresponds to one year under a normal environment. As is clear from FIG. 3, the optical information recording carrier having the organic dye recording layer manufactured by the manufacturing method according to the present embodiment has a block larger than that of the optical information recording carrier manufactured by the conventional manufacturing method shown in FIG. 4 (dotted line). It shows that the error change is small.

[0012]

As described above, in the method for manufacturing an optical information recording carrier according to the present invention, since the innermost peripheral portion of the substrate is in close contact with the protective layer, the protective layer is peeled off due to temperature, humidity, mechanical damage or the like. Information can be accurately recorded / reproduced for a long period of time without promoting deterioration of the organic dye recording layer.

[Brief description of drawings]

FIG. 1 is a sectional view of an optical information record carrier showing an embodiment according to the present invention.

FIG. 2 is a process drawing showing the manufacturing method of the present invention.

FIG. 3 is a reduced view showing a change in block error.

FIG. 4 is a cross-sectional view of an optical information record carrier according to a conventional manufacturing method.

[Explanation of symbols]

1 substrate 2 Organic dye recording layer 3 reflective layer 4 protective layer

Claims (2)

[Claims] 1. An optical information recording carrier comprising at least a substrate, an organic dye-based recording layer, a reflective layer, and a protective layer, which are laminated with margins at the innermost and outermost sides of the substrate. Layer, the organic dye-based recording layer that is approximately equal to the inner diameter of the reflective layer or is formed from the outer periphery thereof, a protective layer that covers the entire surface by spin coating, and a solvent that is contained in the resin of the protective layer. A method for manufacturing an optical information recording carrier, characterized in that the organic dye recording layer on the outer periphery of the reflective layer is dissolved and scattered, and the innermost and outermost peripheries of the substrate are closely adhered by a protective layer. 2. The optical information according to claim 1, wherein after forming the reflective layer, the organic dye recording layer on the outer periphery of the reflective layer is dissolved and washed with a solvent, and the protective layer is formed after the washing. Method for manufacturing record carrier.